Rock pulverizer



1. D. AND S. D. ROSS.

ROCK PULVERIZER.

APPLICATION FILED 1AN.17,1921.

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APPLICATION FILED JAN.I7,1921.

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Application .filecl January 17, 1921. Seri al No. a37,853.

To all whom it may concern: Be it known that we, JOHN D. Ross and STANLEY D. Ross, citizens of the Dominion ofwCanada, residing at Vancouver, in the Province of British Columbia, Canada, have invented certain newand useful improvements in ItockPulverizers, of which the following is a specification. i

. This invention relates to a rock pulverizer of. that class wherein the crushing is effected by a series of balls driven around a circular grooved track, byajsimilarly grooved ring resting .on the upper sides of the balls, and

rotated by any suitable means.

Our improvements are directed to a means for. supplementingthe crushing pressure of t the balls due to the weight on them, and for varying that supplementary pressure to meet ,the requirements of the ore, without applying additional weight; to a meansfor supwporting the rotatable ball driving ring against the pull of thebeltnor chain by i whiehit is driven, and to a means for repassing the pulp through a successionof ball races.

ary features of improvement to which ati tention will be drawn in the following specilication, which fully describes the invention, reference being .madecto the drawing is by which it is accompanied, in which:

the axis of rotation.

.liig. 1 is af vertical sectionof the mill in i Fig. 2, a planof the same, portions being Q removed to show underlying parts, and y 1 .Eig, 3 1s a vertical section of} a nun hhed form of the device. i t e The device comprises abase r1ng2,pretf;-

ei'ably carried on three supportsfi, so as to.

be stable on a "possibly, uneven surface. Within this base ring 52 isset a lower ring 4: 1 having a. circumferential track, groove for 1a series of crushing balls 5. The central xspacewithin the grooved ring 4 is closed by a flattened conicalplate 6 secured inany con venient manner, preferably by aicentral bolt .7 to a bar 8extending.diametrically across theunderside of the ring d X On the ballsb ofthe ring 4 is an upper ring 9 grooved nthe'sarne manner as 4 to retain the balls, and secured 1n any conven- .ient manner tothe inner edge of this upper Lring 9, is ;,a,driving cylinder 10 to the upper edgexof which is secured a sprocket drive booking 11.. r The driveiringll, cylinder 10 and \ringet is ring plate 2% {plate 6 a pipe 31 .waterto wash the rock upper grooved ring 9 are secured together by bolts 12, each ring 11 and 9 being socketed on the ends of the cylinder with key pins 13 fitting in notches in the cylinder ends to retain them in rotational connection, leav- 6O ing to the bolts the work. of holdingthc rings together on the cylinder.

The upper face of the sprocket-ring 11 is grooved to receive a race of balls 14 and on these balls restsxa presser plate 15 which is .6

connected to the base ring 2 by hinged bolts 16, each having a coiled spring 17 between the presser ring and thenuts 18 by which the pressure of these springsis regulated to what is required to supplement theweighton the balls 5 to give the desired crushing effect between the balls 5 and. the grooved rings 4 and 9.

i The sprocket ring llfl an d its connected (parts are rotated by a chain 19 from any convenient source ofpower and the drivingten sion of. the chain is withstoodby a link 20,

connected to. the ring 15 opposite the driv- ,ing chain 19, and" to a standard 21 secured to and upwardly projecting from thebase 8O ring2. 1. i

Secured'to the outer edge of the lower grooved ring 4 and upwardly projecting to above theballs 5 is a border ring22of sheet metal, and secured to} and upwardly projecting from. the upper edge of this ring 22 is a ring screen 23 of fine wire gauze through i which the pulverized rock will pass when of i the required fineness. i i Securedfito the lower edge of the ring 22 where it is connected to the lower grooved which with the ring pl ate 2?. forms an annular gutter 25 through which the screened pulp is delivered to the .p1pef26 for such further treatment asrnay be necessary;

I Adjacent the centre of the conical centre delivers a sufl'icieney of as pulverized from the groove of the plate 4.3

y y In use, the broken rock is delivered through a spout 27 towithin the cylinder 10 and fallingonthe conicalplate 6 passes to between the balls 5 as they roll round the groovesin the ringsdand 9. As the rock is crushedto the required fineness, t is washed through the screen 23 into the gutter 25 and iisulelivered through tliepipe 26.

As theborder ring 22 is carried up above the bearing of the ring Son the balls 5;

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the pulp is retained within the track of the balls in the rings 4 and 9 until the pulp is fine enough to be carried away in the water flow through the screen 23.

Although this is the case in the machine illustrated, we do not desire to be confined to this feature as the screen 23 may be lowered or evenremoved altogether and the pulp be allowed to flow over the edge of the ring 4 into a gutter for delivery to other treatment, in which case the chain 19 and its driving sprocket may be closer to the ring 9.

Around the bottom of the groove in the ring at is a channel 28, which at intervals apart is connected by radial pipes 29 to a common delivery 30 closable with a plug.

The channel 28 and its connected pipes 29 30 are charged with quicksilver with which any free gold released by the crushing will amalgamate. The inner side of the border ring 22 may also be silvered and amalgamated to catch any free gold.

The essential 't'eaturesof our improve- "ment reside in the means for applying a spring ressure upon the upper ring 9 and the balls 5 whereby the crushing effort may be varied at will to suit changed require- Further in the means 20 21 for sustaining the .pull of the driving chain 19 whereby wear of the ball grooves in the rings 4 and 9 to one'side may be avoided.

Fig.3 shows a modification wherein the size of the balls l-t, which support the presser plate 15 is-enlarged that they may serve as crushing balls. In this case the upper side of the ring 9, instead of the gear ring 1--1,'is grooved to receive the balls 14c,:the presser ring '15 being applied to those balls by'the springs 17 as before; and the gear ring 11 is, as before, connected to the 7 ring -9 by the cylinder 10.

The border r1ng 22' is carried slightly above the bearing of the upper tier of balls in the presser plate 15, so that the pul as delivered from outside the'ring-ot bal s 5 is constrained to rise and come under the action -ot the ring-of balls 14 before delivery.

The pulp will thus be subjected to the pu'lverizing action of two ringsof balls, the lower one effecting the primary crushing and the crushed pulp -carried by the water flow will pass through the upper tier. It

is noteworthy 'that in such cases any material that is insufliciently pulverized to rise with the flow of water will again come under the crushing action of the lower balls 5, leaving only the finer material to pass through the upper ring.

The mill is simple to manufacture, is not liable -'to derangement and is effective in use. The provision for spring-loading the pressure on the crushing balls enables the weight to be reduced for transportation. The manner of resisting the tendency of the driving effort to pull the rings and grinding balls toward the side from which the driving effort is exerted is advantageous in maintaining more uniform wear of the ball rings, which alone are depended upon to maintain concentric movement. The addition of a second series of grinding balls enables the pulp to be more finely pulverized, for which there is a growing requirement on the part of mining engineers, while the provision of a means whereby the free gold as released from the rock may be at once amalgamated in the lowest part of the mill relieves the subsequent treatment of the pulp oi? the recovery of that gold.

Having now particularly described our invention, we hereby declare that what we claim as new and desire to be protected in by Letters Patent, is:

1. A rockpulverizer, comprising the combination with a suitable base, of a ring having a circiunterential groove, supported by the base, a series oi crushing balls in the groove of the ring, a second ring circumferentially grooved to rest on the balls in the first named groove, a driving wheel connected to the upper ring, said driving wheel having a circumferential groove in its upper side, a series of balls within the groove,

a presser plate having a circumferential ing a circumferential groove, supported by the base, a series oi? crushing balls in the groove of the ring, a second ring circumferentially grooved to rest on the balls in the first named groove, a driving wheel connected to the upper ring, said driving wheel havingacircumterential groove in its upper side, a series oi balls within the groove, a presser plate having a circumferential groove adapted to rest on the upper series of balls, resilient means applied to the presser plate for pressing the balls in the groove, means for delivering the rock to be'crushed to within the lower ring of balls, and'means for screening the crushed rock and for delivering the screened material.

A rock pulverizer, comprising the comhination with a suitable base, of a ring having a circumferential groove, supported by the base,'a series of crushing balls in the groove of the ring, a second ring circumferentially grooved to rest on the balls in the first named groove, a driving wheel connected to the upper ring, said driving wheel having a circumferential groove in its upper side, a series of balls within the groove,

mamas for sustaining the pull of the driving means,

means for screening the crushed material and for delivering the screened material.

4:. A rock pulverizer, comprising the combination With a suitable base, of a ring having a circumferential groove, supported by the base, aseries of crushing balls in the groove of the ring, a second ring circumferentially grooved to rest on the balls in the first named groove, a driving WllGGl connected to the upper ring, said driving wheel having a circumferential groove in its upper side, a series of balls Within the groove, a presser plate having a circumferential groove adapted to rest on the upper series of balls, rods between the base of the machine and the presser plate, said rods having nuts threaded on their upper ends, springs between the nuts and the presser plate, means for connecting the presser plate to a stationary part of the machine opposite the pull of the driving means, means for delivering' broken rock to Within the ring of crushing balls, and means for delivering the crushed rock from the machine.

In testimony whereof we aflix our signa- JOHN D. noes. STANLEY n. ROSS.

tures. 

